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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>4. Your main() Routine</title><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="YAZ User's Guide and Reference"><link rel="up" href="server.html" title="Chapter 4. Generic server"><link rel="prev" href="server.backend.html" title="3. The Backend API"><link rel="next" href="server.backendfunctions.html" title="5. The Backend Functions"></head><body><link rel="stylesheet" type="text/css" href="common/style1.css"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">4. Your main() Routine</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="server.backend.html">Prev</a> </td><th width="60%" align="center">Chapter 4. Generic server</th><td width="20%" align="right"> <a accesskey="n" href="server.backendfunctions.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="server.main"></a>4. Your main() Routine</h2></div></div></div><p>
As mentioned, your <code class="function">main()</code> routine can be quite brief.
If you want to initialize global parameters, or read global configuration
tables, this is the place to do it. At the end of the routine, you should
call the function
</p><pre class="synopsis">
int statserv_main(int argc, char **argv,
bend_initresult *(*bend_init)(bend_initrequest *r),
void (*bend_close)(void *handle));
</pre><p>
The third and fourth arguments are pointers to handlers. Handler
<code class="function">bend_init</code> is called whenever the server receives
an Initialize Request, so it serves as a Z39.50 session initializer. The
<code class="function">bend_close</code> handler is called when the session is
closed.
</p><p>
<code class="function">statserv_main</code> will establish listening sockets
according to the parameters given. When connection requests are received,
the event handler will typically <code class="function">fork()</code> and
create a sub-process to handle a new connection.
Alternatively the server may be setup to create threads for each
connection.
If you do use global variables and forking, you should be aware, then,
that these cannot be shared between associations, unless you explicitly
disable forking by command line parameters.
</p><p>
The server provides a mechanism for controlling some of its behavior
without using command-line options. The function
</p><pre class="synopsis">
statserv_options_block *statserv_getcontrol(void);
</pre><p>
will return a pointer to a <code class="literal">struct statserv_options_block</code>
describing the current default settings of the server. The structure
contains these elements:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">int dynamic</code></span></dt><dd><p>
A boolean value, which determines whether the server
will fork on each incoming request (TRUE), or not (FALSE). Default is
TRUE. This flag is only read by UNIX-based servers (WIN32-based servers
do not fork).
</p></dd><dt><span class="term"><code class="literal">int threads</code></span></dt><dd><p>
A boolean value, which determines whether the server
will create a thread on each incoming request (TRUE), or not (FALSE).
Default is FALSE. This flag is only read by UNIX-based servers
that offer POSIX Threads support.
WIN32-based servers always operate in threaded mode.
</p></dd><dt><span class="term"><code class="literal">int inetd</code></span></dt><dd><p>
A boolean value, which determines whether the server
will operate under a UNIX INET daemon (inetd). Default is FALSE.
</p></dd><dt><span class="term"><code class="literal">char logfile[ODR_MAXNAME+1]</code></span></dt><dd><p>File for diagnostic output ("": stderr).
</p></dd><dt><span class="term"><code class="literal">char apdufile[ODR_MAXNAME+1]</code></span></dt><dd><p>
Name of file for logging incoming and outgoing APDUs
("": don't log APDUs, "-":
<code class="literal">stderr</code>).
</p></dd><dt><span class="term"><code class="literal">char default_listen[1024]</code></span></dt><dd><p>Same form as the command-line specification of
listener address. "": no default listener address.
Default is to listen at "tcp:@:9999". You can only
specify one default listener address in this fashion.
</p></dd><dt><span class="term"><code class="literal">enum oid_proto default_proto;</code></span></dt><dd><p>Either <code class="literal">PROTO_Z3950</code> or
<code class="literal">PROTO_SR</code>.
Default is <code class="literal">PROTO_Z39_50</code>.
</p></dd><dt><span class="term"><code class="literal">int idle_timeout;</code></span></dt><dd><p>Maximum session idle-time, in minutes. Zero indicates
no (infinite) timeout. Default is 15 minutes.
</p></dd><dt><span class="term"><code class="literal">int maxrecordsize;</code></span></dt><dd><p>Maximum permissible record (message) size. Default
is 64 MB. This amount of memory will only be allocated if a
client requests a very large amount of records in one operation
(or a big record).
Set it to a lower number if you are worried about resource
consumption on your host system.
</p></dd><dt><span class="term"><code class="literal">char configname[ODR_MAXNAME+1]</code></span></dt><dd><p>Passed to the backend when a new connection is received.
</p></dd><dt><span class="term"><code class="literal">char setuid[ODR_MAXNAME+1]</code></span></dt><dd><p>Set user id to the user specified, after binding
the listener addresses.
</p></dd><dt><span class="term">
<code class="literal">void (*bend_start)(struct statserv_options_block *p)</code>
</span></dt><dd><p>Pointer to function which is called after the
command line options have been parsed - but before the server
starts listening.
For forked UNIX servers, this handler is called in the mother
process; for threaded servers, this handler is called in the
main thread.
The default value of this pointer is NULL in which case it
isn't invoked by the frontend server.
When the server operates as an NT service, this handler is called
whenever the service is started.
</p></dd><dt><span class="term">
<code class="literal">void (*bend_stop)(struct statserv_options_block *p)</code>
</span></dt><dd><p>Pointer to function which is called whenever the server
has stopped listening for incoming connections. This function pointer
has a default value of NULL in which case it isn't called.
When the server operates as an NT service, this handler is called
whenever the service is stopped.
</p></dd><dt><span class="term"><code class="literal">void *handle</code></span></dt><dd><p>User defined pointer (default value NULL).
This is a per-server handle that can be used to specify "user-data".
Do not confuse this with the session-handle as returned by bend_init.
</p></dd></dl></div><p>
</p><p>
The pointer returned by <code class="literal">statserv_getcontrol</code> points to
a static area. You are allowed to change the contents of the structure,
but the changes will not take effect until you call
</p><pre class="synopsis">
void statserv_setcontrol(statserv_options_block *block);
</pre><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
You should generally update this structure before calling
<code class="function">statserv_main()</code>.
</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="server.backend.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="server.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="server.backendfunctions.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3. The Backend API </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 5. The Backend Functions</td></tr></table></div></body></html>
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